Cylindrical filter element



FIG. 1 is a front elevation view of a cylindrical filter element showing our new design having a continuous spiral parallel bead pattern;

FIG. 2 is a front elevation view of a cylindrical filter element showing a second embodiment of our new design having a continuous spiral parallel bead pattern; and,

FIG. 3 is a front elevation view of a cylindrical filter element showing a third embodiment of our new design having a continuous spiral parallel bead pattern.

The broken line showing of environmental structure in FIGS. 1-3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a cylindrical filter element, as shown and described. 